Core Peptides Direct vs Good Science Bio
Across the 23 products both vendors stock, Core Peptides Direct has the lower effective price per mg on 19 and Good Science Bio on 4. Core Peptides Direct lists 70 tracked listings across 51 products; Good Science Bio lists 49 across 23. On certificates of analysis the in-stock products we track rate none found at Core Peptides Direct and partial at Good Science Bio. Based on the certificates our crawler found; vendors may publish more than we index. These are price and document observations, not quality ratings, and neither vendor is endorsed.
Core Peptides Direct is a research-peptide vendor that lists 68 injectable peptides, including BPC-157, 5-Amino-1MQ and GHK-Cu.
- Price vs market median
- 18% below market
- Tracked catalog
- 51 products · $
- Cheaper on
- 19 of 23 shared
- COA coverage
- None found
Good Science Bio is a US research-peptide vendor based in Los Angeles, California that lists 36 injectable peptides.
- Price vs market median
- 1% above market
- Tracked catalog
- 23 products · $$
- Cheaper on
- 4 of 23 shared
- COA coverage
- Partial
Vendor facts
Dashes mark facts we have not recorded yet. Vendor-stated details come from each storefront and can change without notice. Facts for Good Science Bio were extracted from the vendor's site and not yet reviewed by us.
Certificates on file
Coverage rates how many of the in-stock products we track have a certificate our pipeline read and matched to a catalog peptide. Based on the certificates our crawler found; vendors may publish more than we index. We do not test products, and a certificate cannot show authenticity, chain of custody or sterility.
Carried by one vendor only
Only at Core Peptides Direct
28 products the other vendor does not list
20 more on the Core Peptides Direct pagePrices shown are per mg for the cheapest in-stock listing we track.
Questions
- Is Core Peptides Direct cheaper than Good Science Bio?
- On the 23 products both vendors stock, Core Peptides Direct has the lower effective price per mg on 19 and Good Science Bio on 4. Each side uses the cheapest in-stock listing we track for that product, after any public discount code, and prices change often.
- How much COA coverage does each vendor have?
- Core Peptides Direct: none found. Good Science Bio: partial, newest test dated 2026-05-27. Based on the certificates our crawler found; vendors may publish more than we index. We do not test products ourselves, and a certificate cannot prove authenticity or sterility.
- How do shipping and payment differ between Core Peptides Direct and Good Science Bio?
- Core Peptides Direct: we have not recorded shipping or payment details yet. Good Science Bio: ships from United States, shipping $18, accepts card. Details come from each vendor's own site and can change without notice; check the storefront before ordering.